<?php
$signature = $_GET["signature"];
      $timestamp = $_GET["timestamp"];
      $nonce = $_GET["nonce"];
      $token = TOKEN;
      $tmpArr = array($token, $timestamp, $nonce);
      sort($tmpArr, SORT_STRING);
      $tmpStr = implode( $tmpArr );
      $tmpStr = sha1( $tmpStr );
      if( $tmpStr == $signature ){
             return true;
      }else{
             return false;
      }
	  